Add basic codenarc checks

* Use gradle to run codenarc tests
* Point jcenter repo address to MCP Artifactory instance
* Add gradle cache and codenarc build report directories to .gitignore

Change-Id: Id5d23de2d6fde8fd4a583b3b67866e1906de8866
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..f8b92c3
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+.gradle
+build